Sky Pool at Keio Plaza Hotel

Located on the seventh floor of Keio Plaza Hotel’s main tower, the Sky Pool feels like a cooling oasis in the midst of Shinjuku’s concrete skyscraper jungle. Have a swim, take in the surrounding garden greens, and then head to the hotel bar for a drink after the pool closes at 8pm – and you’ll still have time to catch your last train home. Prices for the pool usage vary by the hour, but it’s priced at a reasonable ¥4,000 if you visit after 3pm on weekdays.